Proprietary Insecurity

This page lists clearly established cases of insecurity in
proprietary software that has grave consequences or is otherwise
noteworthy.

It would be incorrect to compare proprietary software with a
fictitious idea of free software as perfect. Every nontrivial program
has bugs, and any system, free or proprietary, may have security
holes. But proprietary software developers frequently disregard
gaping holes, or even introduce them deliberately, and the users
are helpless to fix them.

An app to prevent “identity theft” (access to personal data)
by storing users' data on a special server
was
deactivated by its developer which had discovered a security flaw.

That developer seems to be conscientious about protecting personal
data from third parties in general, but it can't protect that data
from the state. Quite the contrary: confiding your data to someone
else's server, if not first encrypted by you with free software,
undermines your rights.

We don't call this a “back door” because it is normal
that you can install a new system in a computer given physical access
to it. However, memory sticks and cards should not be modifiable in
this way.